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• Multi-frequency_receiver abstract "Multi-Frequency signalling, (MF), is similar to the European version, CCITT Signaling System 5, (SS5). The original format was five tones used in pairs. This later evolved to six tones. Because its six tones are used only in pairs, this signaling format is sometimes referred to as "two-out-of-five code" or "two of six."Multi-Frequency receivers have been present in US telephony at least since the late 1940s. In 1940s technology, receivers in 4XB and similar equipment used vacuum tubes. Later ones used RC filters and transistors. Digital filters became commonplace in electronic switching systems of the 1980s. For example, in 5ESS switch such jobs were done by DSPs in the Global Digital Services Unit (GDSU).".
• Multi-frequency_receiver thumbnail DTMF_receiver_at_a_No._5_Crossbar_office._(Museum_of_Communication,_Seattle).jpg?width=300.
• Multi-frequency_receiver wikiPageID "4396498".
• Multi-frequency_receiver wikiPageRevisionID "563215704".
• Multi-frequency_receiver hasPhotoCollection Multi-frequency_receiver.
• Multi-frequency_receiver subject Category:Telephony_equipment.
• Multi-frequency_receiver subject Category:Telephony_signals.
• Multi-frequency_receiver type Abstraction100002137.
• Multi-frequency_receiver type Communication100033020.
• Multi-frequency_receiver type Signal106791372.
• Multi-frequency_receiver type TelephonySignals.
• Multi-frequency_receiver comment "Multi-Frequency signalling, (MF), is similar to the European version, CCITT Signaling System 5, (SS5). The original format was five tones used in pairs. This later evolved to six tones. Because its six tones are used only in pairs, this signaling format is sometimes referred to as "two-out-of-five code" or "two of six."Multi-Frequency receivers have been present in US telephony at least since the late 1940s. In 1940s technology, receivers in 4XB and similar equipment used vacuum tubes.".
• Multi-frequency_receiver label "Multi-frequency receiver".
• Multi-frequency_receiver sameAs m.0b__qj.
• Multi-frequency_receiver sameAs Q6934453.
• Multi-frequency_receiver sameAs Q6934453.
• Multi-frequency_receiver sameAs Multi-frequency_receiver.
• Multi-frequency_receiver wasDerivedFrom Multi-frequency_receiver?oldid=563215704.
• Multi-frequency_receiver depiction DTMF_receiver_at_a_No._5_Crossbar_office._(Museum_of_Communication,_Seattle).jpg.
• Multi-frequency_receiver isPrimaryTopicOf Multi-frequency_receiver.